please respond using excel

You have secured a loan from your bank for 2 years to build your home. The terms of the loan are that you will borrow $120,000 now in year 0. Interest of 9% APR will be charged on the balance monthly. Since no payments will be made during the 2 year loan, the balance will grow. At the end of 2 years, the balance will be converted to a traditional 30 year mortgage at a 6.6% interest rate. What will you pay as monthly mortgage payments (principal and interest only)?

Please respond using excel!